package com.atguigu.gulimall.cart.controller;

import com.atguigu.gulimall.cart.service.CartService;
import com.atguigu.gulimall.cart.vo.Cart;
import com.atguigu.gulimall.cart.vo.CartItem;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import java.util.List;
import java.util.concurrent.ExecutionException;

@Controller
public class CartController {
    @Autowired
    private CartService cartService;

    @ResponseBody
    @GetMapping("/currentUserCartItems")
    public List<CartItem> getCurrentUserCartItems(){
        return cartService.getCurrentUserCartItems();
    }


    @GetMapping("/deleteItem")
    public String deleteItem(@RequestParam("skuId") Long skuId) {
        cartService.deleteItem(skuId);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/countItem")
    public String countItem(@RequestParam("skuId") Long skuId, @RequestParam("num") Integer num) {
        cartService.changeItemCount(skuId, num);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    @GetMapping("/checkItem")
    public String checkItem(@RequestParam("skuId") Long skuId, @RequestParam("check") Integer check) {
        cartService.changeItemCheck(skuId, check);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    /**
     * 浏览器有一个cookie：user-key，标识用户身份，一个月过期
     * <p>
     * 如果第一次使用购物车功能，都会给一个临时用户身份，浏览器保存后每次访问都带
     * <p>
     * 登录，session有登录信息
     * 没登录，按照cookie里的user-key处理
     *
     * @return
     */
    @GetMapping("/cart.html")
    public String cartListPage(Model model) throws ExecutionException, InterruptedException {
        Cart cart = cartService.getCart();
        model.addAttribute("cart", cart);
        return "cartList";
    }

    /**
     * 添加商品到购物车
     * <p>
     * 重定向防止重复提交
     * RedirectAttributes
     * addFlashAttribute:将数据放在session中，可以在页面取出，但是只能取一次
     * addAttribute：将数据放在key-value中
     *
     * @return
     */
    @GetMapping("/addToCart")
    public String addToCart(@RequestParam("skuId") Long skuId, @RequestParam("number") Integer number, RedirectAttributes redirectAttributes) throws ExecutionException, InterruptedException {
        cartService.addToCart(skuId, number);

        redirectAttributes.addAttribute("skuId", skuId);

        return "redirect:http://cart.gulimall.com/addToCartSuccessPage";
    }

    @GetMapping("/addToCartSuccessPage")
    public String addToCartSuccessPage(@RequestParam("skuId") Long skuId, Model model) {
        //重定向到成功页面，再次查询购物车数据即可
        CartItem cartItem = cartService.getCartItem(skuId);
        model.addAttribute("item", cartItem);
        return "success";
    }
}
